<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/animate.css/3.5.1/animate.min.css">
    <style>
        /* 不懂去这个网址
        https://www.dowebok.com/demo/2014/98/ */
        div{
            width: 200px;
            height: 200px;
            background-color: red;
            margin: 0 auto;
        }
    </style>
</head>
<body>
    <div class="animated bounce infinite" id="dowebok"></div>
    <!-- 
        animated    加这个类名才能加动画库里的动画
        bounce      不同动画的类名
        infinite    无限循环
     -->
</body>
</html>